US2472202A - Tool retainer - Google Patents

Description

w. D. FISH TOOL RETAINER Filed June 1, 1946 qw 4 9 1L 7 Patented June 7, 1949 UNITED STATES OFFICE Manufacturing Company,

Pennsylvania a corporation of Application June 1, 1946, -Serial No;"6'l3,819

10 Claims. 1

This invention relates to. retainers for working toolscand more particularly to an improvedretainerifor'the. drill steel of a hammer rock drill.

Anobject of the. present. invention is to provide antimprovedtool retainer. Another object is to provide. animproved retainer for the drill steel mounting for. the retainer yoke. Yet another ob ject' is .to provide an improved one-piece retainer yoke having side. arms formed with integral rear- Ward portions adapted'forlateral connection with trunnions integral with thechuck' housing. A stillfurther object is. to provide an .improved tool retainer having a novel arrangement and combination of parts. These and other objects and advantages of the invention will, howevenhereinafter more fully appear- In the accompanyingdrawing thereis shown for. purposes of illustration one .form'which the invention may assume in practice.

In this drawing:

Fig. 1 is a front elevational view 'of the forward portion of a rock drill with which an illustrative form-of the. improved tool retainer is associated.

Fig. .2 is a side elevational view of the structure shown in Fig. 1.

Fig. 3 is a view in centrallongitudinal section taken substantially on lines .33 of Fig. 2.

Fig.4 is a front end viewof the structure shown in Figs. 1 and 2.

Fig. 5 is a detail sectional View taken substantiallyon line 5-5 of Fig. 1.

Fig. 6 is a cross-sectional view taken on lines 6-45 of Fig. 3.

In .this illustrative construction, the reference character I generally designates a hammer rock drillwith which theimproved tool retainer, general-ly designated 2, is associated. The hammer rock drill, of which'only the forward portion is shown herein,- comprisesa front chuck housing I 3. providing a retainer support and containing a chuck-member 4 for slidingly receiving and supporting the: shank 5 of a conventional reciprocable drill steel. 6. The drill steel has1a usual collar 1 'which lim-its rearward movement of the steel ingpperation. The pressure; fluid harnmermotor of the rock. drill includes a motor cylinder 8 to which the chuck housing is suitably secured and which contains a usual reciprocatory hammer piston for percussively actuating the drill l steel, in a manner well known to those skilled in-the art. The structure of the rock drill may-hegemerallyisimilar to that disclosed in the John'C. Curtis application, Serial N 0.- 667,383, -file'd- May 4, 1946, although it will be evident that thetool retainer may :be associated withother sorts of drills.

Now referringto the improved tool retainer 2, it will be noted that a retainer yoke '9 hasa front yoke or abutment portion I 0- which partially encircles thedrill steel in :advanceof the steel collar 1 and has rearwardly extending side'arms H, H disposed along opposite sides of the chuck housing. The retainer side arms have; at their rearward portions, enlarged generally C-shaped or hook-shaped pivot portions 12 formed with front bearingrecesses I3 anddeeper rearwardly disposed recesses M, the latter recesses receiving and supporting resilient elements preferably rubber bufiers i5 and arcuate plates or shoes l8. Projectinglaterally :fromthe sides of the :chuck housing near its forward end are cylindrical trunnions ll, ll having angularly related flattened surfaces I8 and Ill The axes ofthe-trunnions are parallel and adjacent to a diametricplane passing through the longitudinal center :ofxthe drill. These trunnions project into. the bearing recesses-of the retainer arms; and the rearwardly facing curved bearing surfaces 'of the bearing recesses are yieldingly held in. contact with the cylindrical surfaces of the trunnions by ".fthe rubber buffers which are-held under compression in the arm recesses l4 rearwardly of the trunnions. The compressed rubber buffers act on the arcuateashoes IE -to hold the fiat surfaces. 20

thereof against the flattened surfaces 18 of the retainer yoke centrally near the forward yoke. or

abutment portion l0 is'a curved handle'22 where.- by the-retainer yoke may; be laterally swung 'on itspivotalmounting intoits released position as indicated in dotted lines'inaFig. .2.. When-the retainer. is; .released;.:the :flat; surfaces: 211' 'omthe arcuate shoes l6 engage the flattened surfaces l9 on the trunnions to maintain the retainer yoke in its released position. When the retainer yoke is in the dotted line position shown, the steel shank may be withdrawn axially from the drill chuck. The recessed, generally hook-shaped rearward portions of the yoke side arms have open slots or side openings 23 extending between the bearing recesses and the side edges of the arms by means of which the yoke arms may be readily laterally connected to their bearing mountings on the trunnions. When it is desired to release the retainer yoke from the trunnions, the rubber buffers may be compressed sufiiciently to release the bearing recesses from the trunnions so that the retainer arms may be moved laterally from the trunnions with the latter passing through the side openings 23. As the mode of use of the improved tool retainer will be clearly apparent from the description thereof, further description is considered unnecessary. Other uses and advantages of the improved tool retainer will :be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In combination, a support having lateral trunnions, a swingable tool retainer pivotally mounted on said trunnions and having side arms formed with generally hook-shaped rearward portions provided with front bearing recesses for receiving said trunnions and rearwardly extending deeper recesses, there being side openings extending laterally from the bearing recesses out through the sides of the arms to permit lateral connection of the retainer arms with said trunnions, said bearing recesses having front Walls providing rearwardly facing curved bearing surfaces, yieldable buffers carried by said retainer and arranged in said rearwardly extending recesses rearwardly of said trunnions, and shoes arranged in said rearwardly extending recesses and engaged by said buffers and yieldingly pressed by said buffers into contact with the rear sides of said trunnions to hold the curved bearing surfaces of said bearing recesses rearwardly in pivotal contact with the front sides of said trunnions.

2. In combination, a support having lateral trunnions formed with relatively inclined fiattened surfaces, a swingable tool retainer pivotally mounted on said trunnions and having side arms formed with generally hook-shaped rearward portions provided with front bearing recesses for receiving said trunnions and rearwardly extending deeper recesses, there being side openings extending laterally from said bearing recesses out through the sides of the rearward portions of said arms to permit lateral connection of the retainer arms with said trunnions, said bearing recesses having front walls providing rearwardly facing ciuwed bearing surfaces, yieldable buffers carried by said retainer and arranged in said rearwardly extending recesses rearwardly of said trunnions, and plates arranged in said rearwardly extending recesses and engaged by said buffers and yieldingly pressed by said buffers into contact with the rear sides of said trunnions to hold 4 the curved surfaces of the bearing recesses rearwardly in pivotal contact with the front sides of said trunnions, said plates engaging said flattened surfaces in different positions of said retainer to hold the latter in either its operative tool retaining position or its inoperative released position.

3. In combination, a support having lateral trunnions, a swingable tool retainer pivotally mounted on said trunnions, and having side arms formed with integral enlarged rearward portions adapted for lateral connection with said trunnions, said integral rearward portions provided with recesses for laterally receiving said trunnions, said recesses being closed at their outer sides and having curved front walls providing rearwardly facing bearing surfaces, yieldable buffers carried by said rearward portions of said retainer and arranged in said recesses rearwardly of said trunnions, and plates arranged in said recesses between said buffers and said trunnions and yieldingly pressed by said buffers into contact with the rear sides of said trunnions, said buffers urging said retainer rearwardly relative to said trunnions to hold said bearing surfaces in pivotal contact with the front surfaces of said trunnions.

4. In combination, a support having lateral trunnions near its forward end and adapted to receive the shank of a reciprocable collared tool, a swingable one-piece retainer yoke having side arms adapted for lateral connection with said trunnions and at their rearward portions pivotally mounted on said trunnions, and yieldable means carried by said rearward portions of the side arms of said yoke for urging said side arms rearwardly into pivotal contact with said trunnions, said arms having recesses extending rearwardly of said trunnions to receive said yieldable means and laterally receiving said trunnions, said recesses having curved front Walls providing rearwardly facing bearing surfaces engaging the front surfaces of said trunnions.

5. In combination, a support having a transverse integral trunnion, a swingable one-piece retaining member having a front abutment with which the collar of a reciprocable tool is engageable, and having a side arm provided with an integral rear portion adapted for lateral attachment to said trunnion and pivotally engaging at its rear portion said trunnion, and resilent means carried by the rear portion of said arm rearwardly of said trunnion for yieldingly urging said retaining member rearwardly into pivotal contact with the front side of said trunnion.

6. In combination, a support having lateral trunnions, a swingable tool retainer yoke having integral side arms formed with generally 0-- shaped rearward portions with the open side of each C of sufiicient width to permit lateral connection of said side arms with said trunnions, said C-portions having their inner walls providing recesses with the forward walls of the recesses providing rearwardly facing curved bearing surfaces pivotally engaging the forward surfaces of said trunnions and the rearward portions of the recesses extending rearwardly of said trunnions, and yieldable buffers received in said rearward portions of said recesses and acting on the rear sides of said trunnions for yieldingly urging said side arms rearwardly to maintain said bearing surfaces in pivotal contact with the forward trunnion surfaces.

7. A working implement retainer for percussive tools comprising lateral trunnions rigidly secured to the sides of the tool chuck housing close to the front end of the housing, said housing adapted to receive and support the shank of a collared working implement, a swingable retainer yoke pivotally mounted on said trunnions and having side arms disposed at opposite sides of the chuck housing, said side arms having integral rearward portions adapted for lateral connection with said trunnions and said side arms supporting a yoke portion in advance of said housing and with which the collar of the working implement is engageable, and yieldable buffer means carried by said integral rearward portions of said yokeside arms for urging said yoke rearwardly with respect to said trunnions into pivotal contact with the latter.

8. A working implement retainer for percussive tools comprising lateral trunnions rigidly secured to the sides of the tool chuck housing close to the front end of the housing, said housing adapted to receive and support the shank of a collared working implement, a swingable retainer yoke pivotally mounted on said trunnions and having side arms disposed at opposite sides of the chuck housing, said side arms having integral rearward portions adapted for lateral connection with said trunnions and said side arms supporting a yoke portion in advance of said housing and with which the collar of the working implement is engageable, and yieldable bufler means carried by said integral rearward portions of said yoke-side arms for urging said yoke rearwardly with respect to said trunnions into pivotal contact with the latter, said side arms having elongated recesses therein extending longitudinally thereof for receiving said trunnions and said yieldable bufier means with the latter located in said recesses rearwardly of said trunnions and acting on the rear surfaces of said trunnions for urging said yoke rearwardly with respect to said trunnions.

9. In combination, a support having lateral trunnions, a swingable tool retainer pivotally mounted on said trunnions and having side arms provided with integral enlarged rear pivot portions adapted for lateral connection with said trunnions and having elongated recesses for receiving said trunnions, said recesses having curved front walls providing rearwardly facing bearing surfaces pivotally engaging the front surfaces of said trunnions, yieldable buifers carried by said integral rearward portions of said retainer and arranged in said recesses rearwardly of said trunnions, and shoes guided in said recesses and engaged by said buffers and yieldably pressed by said buffers into contact with the rear surfaces of said trunnions to maintain said curved bearing surfaces in pivotal contact with said trunnions.

10. In combination, a support having lateral trunnions provided with relatively inclined plane surfaces, a swingable tool retainer pivotally mounted on said trunnions and having side arms provided with enlarged rear pivot portions having elongated recesses for receiving said trunnions, said recesses having curved front walls providing rearwardly facing bearing surfaces pivotally engaging the front surfaces of said trunnions, yieldable buiTers carried by said retainer and arranged in said recesses rearwardly of said trunnions, and shoes guided in said recesses and engaged by said buffers and yieldably pressed by said bufiers into contact with the rear surfaces of said trunnions to maintain said curved =bearing surfaces in pivotal contact with said trunnions, said shoes selectively engaging said plane trunnion-surfaces in the different angular positions of said retainer with respect to said trunnions to hold said retainer either in its operative retaining position or its inoperative released position.

WALTER D. FISH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,429,808 Tuttle Sept. 19, 1922 1,962,790 Slates June 12, 1934 1,986,297 Smith Jan. 1, 1935 2,003,924 Curtis June 4, 1935 2,115,047 Curtis Apr. 12, 1938 2,230,046 Curtis Jan. 28, 1941

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